Hello and welcome in week 8.
My Tropicanna didn't grow big, due to my mistake, but she still builds beautiful flowers, and already smells like tropical island.
Again she will be ready in about 60 days, good to consider that when feeding.
We're currently growing the same, and ours at week 7 look like yours at week 4... We're new, but thought we were doing it "right" enough, until we started looking & comparing... We obviously need some more practice! But your pics, etc, have given us hope - your plants all look beautiful!!!